CN1625016A - Apparatus and method for analysis of power transmission line condition - Google Patents
Apparatus and method for analysis of power transmission line condition Download PDFInfo
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- CN1625016A CN1625016A CNA2004100385937A CN200410038593A CN1625016A CN 1625016 A CN1625016 A CN 1625016A CN A2004100385937 A CNA2004100385937 A CN A2004100385937A CN 200410038593 A CN200410038593 A CN 200410038593A CN 1625016 A CN1625016 A CN 1625016A
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Abstract
Apparatus and method for real-time analysis of an electric power transmission link status direct buried or installed in a duct or a tunnel are described. The method includes: real-time measuring a surface distributed temperature of the link by using a distributed temperature sensor installed along a longitudinal direction of the link; calculating a conductor temperature of the link on the basis of the surface distributed temperature and an electric current flowing through the link; calculating a heat flow emitted out of the link on the basis of the surface distributed temperature and the conductor temperature; and real-time calculating a thermal parameter of an environment around the link on the basis of the heat flow. Thus, it is possible to calculate operating conditions of the link more accurately and improve safety of electric power transmission by real-time calculating the thermal parameter of the environment around the link.
Description
Technical field
The present invention relates to a kind of apparatus and method that are used for the analysis of power transmission line line state, relate in particular to a kind of apparatus and method that are used for the real-time analysis of power transmission line line state, it has calculating and shows the thermal impedance of set power transmission lines surrounding environment and the function of thermal capacitance.
Background technology
Term " power transmission lines " used in this specification and the appended claims is defined as: comprise and being used for from supplier of electricity (such as generator, transformer station and power distribution station) transferring electric power to the user cable, joint and the branch of (such as transformer station, power distribution station and end user as building or house), and abbreviate " circuit " hereinafter as.
This circuit is to environmental change, and the variations in temperature around or the place that temporarily is provided with buried such as circuit can make a response sensitively, thereby such environmental change meeting greatly influences the transmission performance and the stability of circuit.Particularly, transmission capacity and the performance that is arranged at underground circuit can seriously be subjected to the influence that thermal parameter is thermal impedance and thermal capacitance.The electric power transfer of circuit can produce heat, and this heat can make the moisture of surrounding soil move, and increases thermal impedance thus.By the increase of the thermal impedance that work caused of circuit, the electric current that this circuit be can bear is limited in a Limiting Level.Therefore, operate this circuit and do not perceive the increase of thermal impedance, can cause the crisis accident, such as thermal breakdown or fire.
At present, as disclosed in Korean Patent Publication No. 2001-79444 or the U.S. Patent number 6,167,525, have some and prevent the trial of these crisis accidents.For example, after the hull-skin temperature of having measured circuit, or measured after the external temperature of the insulating material of circuit longitudinal direction, the conductor temperature in the power transmission cable can be calculated in real time based on the numerical value that records, and is notified to the operator.In addition, the ampere-capacity (or current-carrying capacity) that can bear of circuit can be come out based on the temperature computation of conductor.The numerical value that calculates in above-mentioned two kinds of situations can be with to prevent contingency.Here, when calculating conductor temperature or ampere-capacity, routinely, the thermal impedance of soil is set to the fixed value of international standard defined, such as being 1Km/W in the area, temperate zone.
Yet in fact thermal impedance and thermal capacitance can have the numerical value of variation because of the operating condition of the soil around the circuit or environment or circuit, and conventional technology can't be handled the variation of these extraneous thermal parameters.In addition; though these technology are intended to by real-time calculating conductor temperature; prevent the crisis accident to take preventive measures; but conductor itself calculates because conductor temperature is not based on; and be based on the ambient temperature of circuit outside and be not that the stationary heat parameter that is limited by current status is calculated, so these technology still are not enough to prevent the crisis accident that variation caused by thermal parameter.
The transducer of the thermal parameter of direct measurement surrounding environment, particularly soil also can be set on the other hand.Yet because circuit is oversize, the whole length of monitoring circuit is also impossible in practice.
Summary of the invention
Therefore the invention reside in the solution prior art problems, one of purpose of the present invention is to provide a kind of apparatus and method that are used for calculating in real time the external heat parameter of power transmission lines.
Another object of the present invention is to provides the extraneous thermal parameter that calculates in real time by utilizing, and accurately calculates the real-time Transmission capacity of power transmission lines, thereby prevents the apparatus and method of crisis accident.
To achieve these goals, the invention provides a kind of device that is used for the analysis of power transmission line line state, comprise: the distributed temperature measuring unit, this unit is used for obtaining vertical districution temperature in real time from distributed temperature sensor along vertical setting of directly burying or being arranged at the power transmission lines in pipeline or the tunnel; The conductor temperature computing unit is used for the electric current based on the districution temperature of being calculated by the distributed temperature measuring unit and the power transmission lines of flowing through, and calculates the conductor temperature of power transmission lines; And extraneous thermal parameter computing unit, be used for based on districution temperature that obtains by the distributed temperature measuring unit and the conductor temperature that calculates by the conductor temperature computing unit, the heat flow that calculating is penetrated from power transmission lines, based on heat flow, calculate the thermal parameter of power transmission lines external environment on every side in real time then.
Here preferably, extraneous thermal parameter computing unit is based on the temperature of the external environment around heat flow, districution temperature and the power transmission line line state, perhaps, calculate the thermal impedance of power transmission lines external environment on every side based on the temperature of the external environment around heat flow, districution temperature, the power transmission line line state and the thermal time constant of the external environment around the power transmission lines.
On the other hand, the ambient temperature around the power transmission lines can or utilize the environment distributed temperature sensor that separates to calculate according to districution temperature.
In other words, distributed temperature sensor is preferably fiber optic distributed temperature sensor, also preferably include along first distributed temperature sensor of vertical setting of power transmission lines, with be arranged at underground, and be parallel to first distributed temperature sensor and with first distributed temperature sensor compartment of terrain second distributed temperature sensor consistently, wherein, first distributed temperature sensor is measured districution temperature, and second distributed temperature sensor is measured the ambient temperature around the power transmission lines.
Alternatively, distributed temperature sensor also can be the optical fibre distribution type sensor that forms the loop, one end in this loop is along vertical setting of power transmission lines, the other end is arranged at underground, and be parallel to an aforementioned end and with an aforementioned end consistently at interval, wherein districution temperature is measured at an end in loop, and the ambient temperature around the power transmission lines is measured at the other end in loop.
According to another program of the present invention, a kind of method that is used to analyze the power transmission line line state also is provided, comprise step: (a) utilize distributed temperature sensor, measure the surface distributed temperature of power transmission lines in real time along vertical setting of directly burying or being arranged at the power transmission lines in pipeline or the tunnel; (b), calculate the conductor temperature of power transmission lines based on the electric current of the surface distributed temperature and the power transmission lines of flowing through; (c), calculate the heat flow that penetrates from power transmission lines based on surface distributed temperature and conductor temperature; And, calculate the thermal parameter of power transmission lines external environment on every side in real time (d) based on heat flow.
Utilize above-mentioned line status analytical equipment and method,, can calculate transmission capacity more accurately, and prevent to change the crisis accident that is caused by the environment thermal parameter by the environment thermal parameter around the real-time computational scheme.
Description of drawings
From the following description to embodiment with reference to the accompanying drawings, other purposes of the present invention and scheme will be more obvious, in the accompanying drawings:
Fig. 1 shows the schematic representation of apparatus according to the analysis that is used for the power transmission line line state of one embodiment of the present of invention;
Fig. 2 shows the cutaway view of the underground power cable of Fig. 1;
Fig. 3 and Fig. 4 are the hot approximation circuit figure of the underground power cable of Fig. 2;
Fig. 5 shows the schematic representation of apparatus according to the analysis that is used for the power transmission line line state of another embodiment of the present invention;
Fig. 6 shows the device schematic diagram according to the analysis that is used for the power transmission line line state of further embodiment of this invention.
Embodiment
With reference to the accompanying drawings, the preferred embodiments of the present invention are described particularly.Yet, terminology used here and vocabulary should not be interpreted as being limited to general and literal meaning, and be interpreted as being based on according to due meaning of the spirit and scope of the present invention and notion, these spirit and scope are based on such principle, and it is the suitable notion that is convenient to best illustration with term definition that this principle allows the inventor.Therefore, the description here not should be understood to limit the scope of the invention, but the explanation for the preferred embodiment of the present invention only is provided.Should be appreciated that and do not deviate from the spirit and scope of the present invention, can make other changes and change these embodiment.
Fig. 1 shows the device according to the analysis that is used for line status of first embodiment of the invention.
With reference to Fig. 1, the line status analytical equipment 30 of this embodiment comprises: distributed temperature measuring unit 31, by utilizing distributed temperature sensor 32, measure the vertical districution temperature that is arranged at underground power transmission lines 20; Conductor temperature computing unit 33 is used for the electric current 20 based on districution temperature and current through line, the conductor temperature in the computational scheme; And thermal parameter computing unit 35, be used for based on conductor temperature and districution temperature the thermal parameter of the external environment (or soil) around the computational scheme 20; And current-carrying capacity computing unit 36, be used for based on conductor temperature and thermal parameter, calculate the ampere-capacity (or current-carrying capacity) that this circuit can bear.
The computer of enough supercomputings of line status analytical equipment 30 utilizable energies and interim storage is realized, and each parts 31,33,35 or 36 can utilize operating unit, processing unit or memory in the computer to realize.In addition, parts 31,33,35 and a part of 36, this part can be represented by the algorithm of mentioning later, and this part can be provided the executable program of a computer, and this program can be stored in the computer-readable storage medium.
In addition, line status analytical equipment 30 also comprises: display unit 37 is used for past state, current state or state (promptly after the scheduled period sometime state) in the future to operator's circuit 20; And database 38, be used to store the data relevant with such line status.
Now, specifically describe the structure and the operation of the line status analytical equipment 30 of present embodiment, and according to the method that is used for the analysis circuit state of present embodiment.
In the present embodiment, distributed temperature sensor 32 is preferably optical fiber, and the one end is connected to distributed temperature measuring unit 31.As shown in Figure 2, optical fiber 32 is attached to the surface of circuit 20, i.e. the outer surface of shell 23.As for optical fiber, most preferably be that diameter is that 50 μ m/125 μ m (kernel/coating) and length are 12km or shorter multimode fiber.
Fig. 2 of the simplified cross-sectional view of reference table timberline road 20 or power cable, circuit 20 comprises: conductor 21 is positioned at the central authorities as the circuit of current channel; Insulating barrier 22 is round conductor 21; And shell 23, as the protective layer of cable.Certainly, in fact power cable has more element such as stretchable metal wire, for for simplicity, they is omitted from accompanying drawing.
On the other hand, though be used as the surface that shell 23 is represented and be described as being attached to the optical fiber of distributed temperature sensor 32 here, this optical fiber also can be inserted into and contact with the excircle of insulating barrier 22, and perhaps the inner periphery with shell 23 contacts.In addition, though optical fiber is selected as distributed temperature sensor 32 in this embodiment, this only is a preferred exemplary, also can adopt all temps transducer.When this optical fiber was replaced by another kind of temperature sensor, the quantity of distributed temperature measuring unit 31 and concrete structure may change along with temperature sensor.
Distributed temperature measuring unit 31, this unit are connected to an end of optical fiber, by with laser directive optical fiber and detect the wavelength of return projector then, thereby on the whole length of the circuit 20 that optical fiber 32 is set up, the districution temperature on computational scheme 20 surfaces in real time.More specifically, distributed temperature measuring unit 31 penetrates laser pulse to optical fiber 32, these pulses have the width of several ns to tens ns on the frequency of several kHz, then that luminous power data Raman scattering light and temperature correlation in the reflector laser are in addition average, thereby obtain temperature data.This temperature can be measured for per 1 meter circuit 20, and its accuracy is ± 1.5 ℃.
Conductor temperature computing unit 33 is based on the districution temperature on the surface of the circuit 20 that is obtained by distributed temperature measuring unit 31 and the electric current of current through line 20, temperature, the temperature of insulating barrier 22 and the temperature of shell 23 of calculating conductor 21 in real time.In addition, thermal parameter computing unit 35 calculates thermal parameter, such as the thermal impedance and/or the thermal capacitance of the soil 10 around the circuit 20 based on the surface distributed temperature of circuit 20, from the heat flow of circuit 20 ejaculations and the temperature of the soil 10 around the circuit 20.Referring now to the hot approximation circuit figure of expression power cable, the process of calculating conductor temperature and thermal parameter is described particularly.
Fig. 3 is a circuit diagram, is illustrated in each element of circuit 20 (or power cable) and the heat transmission between the soil 10 of circuit 20 approx, and wherein CI and CO represent the inside and outside of circuit respectively.In this circuit diagram, node N21, N22, N23, N24, N32 and N25 identify surface, distributed temperature sensor 32 and the zone around the soil 10 that is subjected to the heat effects that cable produces of circuit 20 of conductor 21, insulating barrier 22, shell 23, cable or shell respectively.In addition, θ
1To θ
4, θ
eAnd θ
AmbIdentify the temperature of each node respectively, T
1To T
5Thermal impedance between the identification nodes, Q
1To Q
4Sign constitutes the thermal capacitance of the material of each node, i
1To i
5Identify the heat of each node of flowing through.On the other hand, W
c, W
dAnd W
sBe the thermal source that when electric current current through line 20, in circuit 20, produces, and identify the shell loss that produces in the dielectric absorption that produces in the conductor losses that produces in the conductor 21, the insulating barrier 22 and the shell 23 respectively.Conductor losses W
cBe based on and consider that the Joule loss that is directly proportional with the quadratic sum electric current of Conductor Impedance, the proximity effect that causes with the mobile relevant skin effect of alternating current, by adjacent cable wait definite.Shell loss is based on to be considered the loss of shell circulating current and is determined by the loss that the type of the earthing of casing causes.
In these values, Q
1To Q
4And T
1To T
4Character and structure by each material that constitutes cable are determined, and W
c, W
dAnd W
sCharacter (such as impedance) and structure by electric current and each material of the conductor 21 of flowing through are determined.The electric current of current through line 20 or conductor 21 can obtain by measuring this electric current by current measuring unit 34, perhaps obtains by the data that receive about current electric current from power transmission terminal.In addition, θ
eObtain by aforementioned distributed temperature measuring unit 31.
Similar to the analysis of general circuit, θ
1To θ
eCan obtain by the hot approximation circuit of utilizing gained numerical analysis Fig. 3.In addition, the flow through heat flow i of each node
1To i
4And the heat flow i that penetrates from cable
5Can utilize following equation to obtain.
i
5＝W
c+W
d+W
s-(i
1+i
2+i
3+i
4)
Then, the thermal impedance T5 of the soil 10 around the circuit can utilize following equation to obtain.
Equation 2
Here, the surface distributed temperature θ of circuit 20
e, promptly the temperature of distributed temperature sensor 31 can obtain by aforementioned distributed temperature measuring unit 31, the temperature θ of the soil 10 around the circuit 20
AmbThe numerical value (for example, when cable is directly buried or be arranged in the pipeline, be 25 ℃ in the zone, temperate zone, and be 40 ℃ when cable is arranged in the tunnel) that can utilize international standard IEC60287 to set for power cable.
On the other hand, as shown in Figure 4, except that the thermal impedance of the soil 10 around the computational scheme 20, perhaps do not calculate this thermal impedance, can calculate thermal capacitance in real time yet.
The hot approximation circuit figure of Fig. 4 is with the different of Fig. 3, the thermal capacitance Q of the soil around the circuit
5Be increased in the circuit diagram of Fig. 3.In the hot approximation circuit figure of Fig. 4, the thermal capacitance Q of the soil 10 around the circuit 20
5Be to utilize following equation 3 to calculate.In equation 3, k is the thermal time constant of soil, i.e. a time parameter in the temperature funtion, and when the soil moisture around the circuit raise along with the heating of circuit 20, this time parameter increased in time.Thermal time constant k depends on the geographical feature of soil.
Equation 3
On the other hand, the thermal impedance T of the soil around the circuit
5With thermal capacitance Q
5Be correlated with, shown in following equation.
Equation 5
After the thermal parameter of the soil 10 around the conductor temperature of circuit 20 and the circuit 20 was calculated, current-carrying capacity computing unit 36 can be worth based on these, the ampere-capacity that computational scheme 20 can bear.In brief, identical with the situation of routine, current-carrying capacity also can be only based on conductor temperature or only calculate based on the thermal parameter that calculates.Particularly, the conductor temperature of being constructed by the line loop operation history in one period scheduled period in past, and the relation between the circuit ampere-capacity in the future will form a database is used to calculate the current-carrying capacity of the scheduled period in future.When utilizing thermal parameter, current-carrying capacity can be calculated in an identical manner.
When calculating scheduled period the current-carrying capacity of (be preferably various time durations, such as 2 hours, 4 hours, 8 hours, 12 hours, 24 hours, 48 hours, 100 hours or the like) in the future, real-time management is carried out in the operation of circuit 20.In other words, when real-time supervision conductor temperature and thermal parameter, if conductor temperature or thermal impedance are approaching or surpass a predetermined standard time, this device can give the alarm.
Preferably, this monitoring of circuit 20, warning and management are undertaken by the display unit 37 that is provided with in the line status analytical equipment 30 as shown in Figure 1.In addition, preferably be accumulated among every of database 38 such as the data such as surface distributed temperature, conductor temperature, thermal parameter and current-carrying capacity of circuit 20.Especially, because the whole length of circuit 20 monitors according to every meter, so the line status analytical equipment of this embodiment can be managed lot of data.
Fig. 5 represents the line status analytical equipment according to another embodiment of the present invention.Referring now to Fig. 5, the line status analytical equipment of this embodiment is described, emphasis is described and previous embodiment feature and structure inequality.
As shown in Figure 5, the line status analytical equipment 30 of this embodiment comprises two distributed temperature sensor 32a and 32b in distributed temperature measuring unit 31a.Here, the first distributed temperature sensor 32a is used for the surface distributed temperature of measurement circuitry 20, the distributed temperature sensor 32 identical (referring to Fig. 1) of this point and previous embodiment, and second distributed sensor (or environment distributed temperature sensor) 32b to be being parallel to the first distributed temperature sensor 32a, and with the first distributed temperature sensor 32a setting of turning up the soil at interval consistently.Like this, the second distributed temperature sensor 32b temperature θ of the soil 10 around the measurement circuitry 20 directly
Amb(referring to Fig. 3,4 and equation 2,3), thereby can obtain than previous embodiment thermal parameter more accurately.
Fig. 6 represents the line status analytical equipment according to further embodiment of this invention.Referring now to Fig. 6, the line status analytical equipment of this embodiment is described, emphasis is described and previous embodiment feature and structure inequality.
As shown in Figure 6, the line status analytical equipment 30 of this embodiment comprises the distributed temperature sensor 32c that forms a loop, and this loop is connected to distributed temperature measuring unit 31b.The end of loop (being distributed temperature sensor) 32c is used for the surface distributed temperature of measurement circuitry 20, this point is identical with the distributed temperature sensor 32 or the 32b (referring to Fig. 1 to Fig. 5) of previous embodiment, and the other end of loop 32c is provided with in the mode of the end that is parallel to loop 32c, and with loop 32c consistently at interval.Therefore, the other end of the loop 32c temperature θ of the soil 10 around the measurement circuitry 20 directly
Amb(referring to Fig. 3,4 and equation 2,3), thereby can obtain than previous embodiment thermal parameter more accurately.
On the other hand, though represented and described circuit 20 to be directly to be buried in underground, identical principle and structure to can be applicable to circuit 20 and be arranged at situation in pipeline or the tunnel in the foregoing description.
The present invention is described particularly, yet be to be understood that, the detailed description of the expression preferred embodiment of the present invention and concrete example only provide as an illustration, to those skilled in the art, from this detailed description, change and remodeling is conspicuous with interior making in the spirit and scope of the present invention.
According to the present invention, owing to calculated the thermal parameter of circuit surrounding environment in real time, the mode of operation of managing power transmission line has more accurately prevented from anyly may fail the crisis accident that can take place when suitably reflecting in the variation of environment thermal parameter thus.
Because the thermal parameter of the soil around the underground power transmission lines can be shown to line operator, the present invention also can guarantee the safety and the efficient of circuit simultaneously.
Claims (19)
1. device that is used for the analysis of power transmission line line state comprises:
Distributed temperature measuring unit, this unit are along vertical setting of directly burying or being arranged at the power transmission lines in pipeline or the tunnel, to obtain vertical districution temperature in real time from distributed temperature sensor;
The conductor temperature computing unit is used for the electric current based on the districution temperature that is obtained by this distributed temperature measuring unit and this power transmission lines of flowing through, and calculates the conductor temperature of this power transmission lines; And
Extraneous thermal parameter computing unit, be used for based on districution temperature that obtains by this distributed temperature measuring unit and the conductor temperature that calculates by this conductor temperature computing unit, the heat flow that calculating is penetrated from this power transmission lines, based on this heat flow, calculate the thermal parameter of this power transmission lines external environment on every side in real time then.
2. the device that is used for the analysis of power transmission line line state as claimed in claim 1, wherein:
This external world's thermal parameter computing unit calculates the thermal impedance of this power transmission lines external environment on every side based on the ambient temperature around this heat flow, this districution temperature and this power transmission line line state.
3. the device that is used for the analysis of power transmission line line state as claimed in claim 1, wherein:
This external world's thermal parameter computing unit calculates the thermal capacitance of this power transmission lines external environment on every side based on the thermal time constant of ambient temperature around this heat flow, this districution temperature, this power transmission line line state and the external environment around this power transmission lines.
4. as claim 2 or the 3 described devices that are used for the analysis of power transmission line line state, wherein:
This distributed temperature sensor is a fiber optic distributed temperature sensor, and comprise along first distributed temperature sensor of vertical setting of this power transmission lines, with be arranged at underground and be parallel to this first distributed temperature sensor and with this first distributed temperature sensor at interval second distributed temperature sensor consistently
Wherein, this first distributed temperature sensor is measured this districution temperature, and this second distributed temperature sensor is measured the temperature of this external environment around this power transmission lines.
5. as claim 2 or the 3 described devices that are used for the analysis of power transmission line line state, wherein:
This distributed temperature sensor is the fiber optic distributed temperature sensor that forms the loop, and an end in this loop is along vertical setting of this power transmission lines, and the other end is arranged at underground, and be parallel to this end and with this end consistently at interval,
Wherein, this districution temperature is measured at this end in this loop, and the temperature of this external environment around this power transmission lines is measured at this other end in this loop.
6. the device that is used for the analysis of power transmission line line state as claimed in claim 1, also comprise the current-carrying capacity computing unit, be used for calculating the ampere-capacity that this power transmission lines can flow through at the fixed time based on conductor temperature that calculates by this conductor temperature computing unit and the thermal parameter that calculates by this external world's thermal parameter computing unit.
7. the device that is used for the analysis of power transmission line line state as claimed in claim 1, also comprise the current-carrying capacity computing unit, be used for the conductor temperature that calculates based on by this conductor temperature computing unit, calculate the ampere-capacity that this power transmission lines can flow through at the fixed time.
8. the device that is used for the analysis of power transmission line line state as claimed in claim 1 also comprises the thermal parameter display unit, is used for showing in real time the thermal parameter that is calculated by this external world's thermal parameter computing unit.
9. the device that is used for the analysis of power transmission line line state as claimed in claim 1 also comprises the conductor temperature display unit, is used for showing in real time the conductor temperature that is calculated by this conductor temperature computing unit.
10. the device that is used for the analysis of power transmission line line state as claimed in claim 1 also comprises current measuring unit, is used to measure the electric current of this power transmission lines of flowing through.
11. a method that is used for the analysis of power transmission line line state comprises step:
(a) by using distributed temperature sensor, measure the surface distributed temperature of this power transmission lines in real time along vertical setting of directly burying or being arranged at the power transmission lines in pipeline or the tunnel;
(b), calculate the conductor temperature of this power transmission lines based on the electric current of this surface distributed temperature and this power transmission lines of flowing through;
(c), calculate the heat flow that penetrates from this power transmission lines based on this surface distributed temperature and this conductor temperature; And
(d), calculate the thermal parameter of this power transmission lines external environment on every side in real time based on this heat flow.
12. the method that is used for the analysis of power transmission line line state as claimed in claim 11, wherein:
Step (d) is calculated the thermal impedance of this power transmission lines external environment on every side based on the temperature of the external environment around this heat flow, this surface distributed temperature and this power transmission lines.
13. the method that is used for the analysis of power transmission line line state as claimed in claim 12, wherein: step (d) is calculated this thermal impedance T by utilizing following equation:
Wherein be θ
eBe the surface distributed temperature, θ
AmbBe the ambient temperature around this power transmission lines, i is this heat flow.
14. the method that is used for the analysis of power transmission line line state as claimed in claim 11, wherein:
Wherein step (d) is calculated the thermal capacitance of this power transmission lines external environment on every side based on the temperature of the external environment around this heat flow, this surface distributed temperature, this power transmission lines and the thermal time constant of the external environment around this power transmission lines.
15. the method that is used for the analysis of power transmission line line state as claimed in claim 14, wherein:
Step (d) is calculated this thermal capacitance Q by utilizing following equation:
Wherein be θ
eBe the surface distributed temperature, θ
AmbBe the temperature of the external environment around this power transmission lines, i is this heat flow, and k is this thermal time constant.
16. as claim 12 or the 14 described methods that are used for the analysis of power transmission line line state, wherein:
The temperature of the external environment around this power transmission lines is measured by environment distributed temperature sensor, this environment distributed temperature sensor is arranged at underground, and be parallel to this distributed temperature sensor and with this distributed temperature sensor consistently at interval.
17. as claim 12 or the 14 described methods that are used for the analysis of power transmission line line state, wherein:
This distributed temperature sensor is the fiber optic distributed temperature sensor that forms the loop, and an end in this loop is along vertical setting of this power transmission lines, and the other end is arranged at underground, and be parallel to this end and with this end consistently at interval,
Wherein, this surface distributed temperature is measured at this end in this loop, and the temperature of the external environment around this power transmission lines is measured at this other end in this loop.
18. the method that is used for the analysis of power transmission line line state as claimed in claim 11 wherein also comprises the step of calculating electric current based on this conductor temperature and this thermal parameter, this electric current is meant the electric current that this power transmission lines can flow through at the fixed time.
19. the method that is used for the analysis of power transmission line line state as claimed in claim 11 wherein also comprises the step of calculating electric current based on this conductor temperature, this electric current is meant the electric current that this power transmission lines can flow through at the fixed time.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2003-0087725 | 2003-12-04 | ||
| KR1020030087725 | 2003-12-04 | ||
| KR1020030087725A KR100567887B1 (en) | 2003-12-04 | 2003-12-04 | Apparatus and method for state analysis of power transmission and distribution link with real-time external passion water calculation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1625016A true CN1625016A (en) | 2005-06-08 |
| CN100373745C CN100373745C (en) | 2008-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100385937A Expired - Fee Related CN100373745C (en) | 2003-12-04 | 2004-04-27 | Apparatus and method for analysis of power transmission line condition |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7039535B2 (en) |
| KR (1) | KR100567887B1 (en) |
| CN (1) | CN100373745C (en) |
| MY (1) | MY140659A (en) |
| SA (1) | SA04250342B1 (en) |
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| CN106052614A (en) * | 2015-04-07 | 2016-10-26 | Lios技术有限公司 | Method and device for monitoring subsea cable |
| CN108736569A (en) * | 2017-04-21 | 2018-11-02 | 福特全球技术公司 | Method and system for the temperature for monitoring power distribution circuit |
| CN111693801A (en) * | 2020-05-09 | 2020-09-22 | 中国电力科学研究院有限公司 | System and method for measuring temperature rise characteristic of power cable in complex microenvironment |
| CN114707332A (en) * | 2022-04-07 | 2022-07-05 | 天津大学 | A method for calculating the average power capacity of medium-integrated suspension lines |
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| BRPI0513570A (en) * | 2004-07-21 | 2008-05-06 | Underground Systems Inc | dynamic line evaluation system with real-time tracking of driver deformation to establish maximum allowed driver loading as limited by offset |
| US7167806B2 (en) * | 2004-08-17 | 2007-01-23 | International Business Machines Corporation | Method and system for measuring temperature and power distribution of a device |
| KR100768388B1 (en) * | 2005-10-29 | 2007-10-18 | 한국전력공사 | Power Cable Resistance Heat Simulation System |
| KR100973545B1 (en) * | 2008-05-13 | 2010-08-02 | 한국전력공사 | Surveillance System Using Wireless Sensor of Underground Power Cable Cable Box |
| US20100052642A1 (en) * | 2008-08-26 | 2010-03-04 | Broadcom Corporation | System and method for using a phy's discovery of cable shielding for power over ethernet current capacity setting and temperature de-rating |
| CN101893490B (en) * | 2010-03-11 | 2014-11-26 | 上海华魏光纤传感技术有限公司 | Receiving subsystem for distributed fiber temperature sensing system and monitoring method thereof |
| CN102955160A (en) * | 2011-08-19 | 2013-03-06 | 湖北省电力公司电力科学研究院 | Three-dimensional laser radar technology based transmission line tower parameter determination method |
| CN102590594B (en) * | 2012-03-07 | 2014-05-28 | 广东电网公司佛山供电局 | Transient state thermal circuit model-based method and device for determining permissible current of overhead conductor |
| CN102662130A (en) * | 2012-06-05 | 2012-09-12 | 广东电网公司电力科学研究院 | Underground cable joint management system and method |
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| US5140257A (en) * | 1984-06-22 | 1992-08-18 | Davis Murray W | System for rating electric power transmission lines and equipment |
| US4886980A (en) * | 1985-11-05 | 1989-12-12 | Niagara Mohawk Power Corporation | Transmission line sensor apparatus operable with near zero current line conditions |
| US4847780A (en) * | 1987-08-21 | 1989-07-11 | Tennessee Valley Public Power Association | Current measuring apparatus |
| US5181026A (en) * | 1990-01-12 | 1993-01-19 | Granville Group, Inc., The | Power transmission line monitoring system |
| US6167525A (en) * | 1997-02-26 | 2000-12-26 | Pirelli Cavi E Sistemi S.P.A. | Method and system for analysis of electric power transmission link status |
| KR100609995B1 (en) | 1999-07-23 | 2006-08-09 | 삼성전자주식회사 | Semiconductor memory device |
| JP2003036754A (en) * | 2001-07-23 | 2003-02-07 | Sumitomo Electric Ind Ltd | DC transmission line, power cable and their design method |
-
2003
- 2003-12-04 KR KR1020030087725A patent/KR100567887B1/en not_active Expired - Fee Related
-
2004
- 2004-04-16 MY MYPI20041417A patent/MY140659A/en unknown
- 2004-04-23 US US10/831,560 patent/US7039535B2/en not_active Expired - Fee Related
- 2004-04-27 CN CNB2004100385937A patent/CN100373745C/en not_active Expired - Fee Related
- 2004-10-18 SA SA4250342A patent/SA04250342B1/en unknown
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106052614A (en) * | 2015-04-07 | 2016-10-26 | Lios技术有限公司 | Method and device for monitoring subsea cable |
| US10620245B2 (en) | 2015-04-07 | 2020-04-14 | Nkt Photonics Gmbh | Method and device for monitoring a submarine cable |
| CN108736569A (en) * | 2017-04-21 | 2018-11-02 | 福特全球技术公司 | Method and system for the temperature for monitoring power distribution circuit |
| CN111693801A (en) * | 2020-05-09 | 2020-09-22 | 中国电力科学研究院有限公司 | System and method for measuring temperature rise characteristic of power cable in complex microenvironment |
| CN111693801B (en) * | 2020-05-09 | 2023-05-12 | 中国电力科学研究院有限公司 | A system and method for measuring temperature rise characteristics of power cables in complex microenvironments |
| CN114707332A (en) * | 2022-04-07 | 2022-07-05 | 天津大学 | A method for calculating the average power capacity of medium-integrated suspension lines |
Also Published As
| Publication number | Publication date |
|---|---|
| SA04250342B1 (en) | 2008-06-04 |
| MY140659A (en) | 2010-01-15 |
| KR20050054364A (en) | 2005-06-10 |
| US7039535B2 (en) | 2006-05-02 |
| CN100373745C (en) | 2008-03-05 |
| KR100567887B1 (en) | 2006-04-04 |
| US20050125174A1 (en) | 2005-06-09 |
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